Dr. Venkman wrote:See the swirlys? Gotta lose the swirls. The rest is just lint...
I know you mentioned trying the Novus polish with poor results. FWIW, the stuff I used on my clear kit was Meguiar's Mirror Glaze #10 and #17. It didn't take out every last scratch, but it did do a pretty good job. I did every drum with both formulas on the outside and the inside. I also used a #18 "plastic detailer", but that didn't seem to do much. I guess it's used for just routine polishing/cleaning/maintenance- they say not to use Windex or other ammonia-based products on the shells.
If I were you, I'd leave that seam white until I got the whole set put back together, heads and all. Then, if it still bugs you, you could go back and try and color it. I found that some of the details I was really sweating over seemed pretty insignificant once everything was put together and I was able to stand back and look at the "big picture". Plus, I'm usually not a fan of opaque heads on Vistas, but a white coated Ludwig logo head on the front of the kick might look, as they say, "tits".
here's a blue kit w/ a white front head... it works best w/ the darker shells, rather than yellow or clear...